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The Principle of Equivalence - Newtonian Gravity
Newton came along with ordinary Newtonian mechanics, the thing that made him money was using it to predict the planets moving around the sun. Under the force of gravity, right, when you have a new theory of mechanics, the first thing you want to do is figure out how gravity works in it. And so when you come up with relativity, electromagnetism fits into it very, very nicely, but Newtonian gravity didn't. So you were going to have to change Newton's theory of gravity a little bit.